No I didn't actually test it but it does have power on it and it will fill up the ffm completely empty in just a couple seconds

 

Well I'm still restoring my truck, almost have it ready for the body shop but I still have a running issue. I have it narrowed down the a fuel delivery problem though. Heres the thing, I can pull out the ffm, dump the fuel out and spray brake cleaner through the outlet to rinse out the screen, it does have some small particles in it usually. Then I can put it back on truck and fire it up and it runs perfect. Takes fuel immediately and idles right and everything. After it runs for a while I can turn it off and let it set, then I'm back to square one, it starts but idles low and won't rev for a few minutes. I can take out the ffm, clean, and perfect again. I don't see enough contamination in the ffm to cause a fuel restriction. Any ideas?

 

Still no luck guys please help. I've replaced fuel tank, sending unit, fuel pump on frame, oil pressure sender, new filter housing assembly with new heater. It cranks a few seconds before it will start and then it still won't take fuel for a while. I can crack the water drain valve, crank it over then close it and it will start right up and run good. I check the pressure today, my gauge doesn't read low pressure very well but it looked to be around 7-8psi while cranking and running, but when I shut truck off the pressure drops off pretty quick. It acts like it loosing it's prime. I have wired pump straight to power to check for fuel leaks and everything is dry. Please help me guys I'm lost and I want to get this truck on the road I have way too much money in it now to sell it.

 

When you say it runs good, does that mean you drive it for hours straight with no problems?

 

Yes drove it all day yesterday and runs great. I can even stop and turn it off and start it back immediately and it still won't take fuel for a few seconds. Once it starts taking fuel it will run normal

 

You are confusing me. You say the fuel pressure drops when you cut the truck off, as it should considering you cut power to the lift pump. I don't see how that is a symptom of anything.

With the water drain valve open and "cranking" doesn't make sense either. Any lift pump pressure will be weakened by having a bypassed line. I don't see how that will help fuel delivery, if anything make it worse.

You got a weird bug there, might be a loose/bad wire connection or a sock restriction would be my best guess. What brand of sending unit did you install?

 

I had a fuel pressure gauge hooked to the drain valve therefore I had to open it to get pressure to the gauge, I'm not sure how fast the system is suppose to lose pressure once it's shut down. Not sure on brand of sending unit but all my issues were happening before I started replacing parts so I know the parts I've replaced has nothing to do with the problem. I'm not familiar with these 6.5 fuel systems so I just been guessing with parts. It acts like it looses it's prime and has to build it back up before it will start to rev. All I know is when I start it I cannot just take off driving, it will start pretty good, it cranks a few seconds but it is a diesel then it will start and idle fine, but when I press pedal down it will not rev. After it runs for a few minutes it will start revving and running normal. It's like the injector pump is waiting for some type of info before it will let the accelerator work. I've checked all the wiring and everything I know to check. The only thing that makes a difference is if I open bleed valve on top of filter housing and crank it until fuel comes out then close it, the truck will almost immediately take of revving like it should. I'm lost and I can't afford a $1000 injector pump if it's not bad.

 

try plugging it in over night and start it up, rev it a couple times then drive it. report back.

 

I've tried plugging it in a few times, it doesn't make a difference, it still won't rev up. The temperature doesn't affect it, the glow plugs are working also

 

dumb question, have you put a pmd on it yet?